ircd-hybrid-8/src/whowas.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  whowas.c: WHOWAS user cache.
 *
 *  Copyright (C) 2005 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */

#include "stdinc.h"
#include "whowas.h"
#include "client.h"
#include "hash.h"
#include "irc_string.h"
#include "ircd.h"
#include "ircd_defs.h"
#include "numeric.h"
#include "s_serv.h"
#include "s_user.h"
#include "send.h"
#include "s_conf.h"
#include "memory.h"

/* internally defined function */
static void add_whowas_to_clist(struct Whowas **, struct Whowas *);
static void del_whowas_from_clist(struct Whowas **, struct Whowas *);
static void add_whowas_to_list(struct Whowas **, struct Whowas *);
static void del_whowas_from_list(struct Whowas **, struct Whowas *);

struct Whowas WHOWAS[NICKNAMEHISTORYLENGTH];
struct Whowas *WHOWASHASH[HASHSIZE];

static unsigned int whowas_next = 0;

void
add_history(struct Client *client_p, int online)
{
  struct Whowas *who = &WHOWAS[whowas_next];

  assert(client_p && client_p->servptr);

  if (who->hashv != -1)
  {
    if (who->online)
      del_whowas_from_clist(&(who->online->whowas),who);
    del_whowas_from_list(&WHOWASHASH[who->hashv], who);
  }

  who->hashv = strhash(client_p->name);
  who->logoff = CurrentTime;

  /* NOTE: strcpy ok here, the sizes in the client struct MUST
   * match the sizes in the whowas struct
   */
  strlcpy(who->name, client_p->name, sizeof(who->name));
  strcpy(who->username, client_p->username);
  strcpy(who->hostname, client_p->host);
  strcpy(who->realname, client_p->info);

  strlcpy(who->servername, client_p->servptr->name, sizeof(who->servername));

  if (online)
  {
    who->online = client_p;
    add_whowas_to_clist(&(client_p->whowas), who);
  }
  else
    who->online = NULL;

  add_whowas_to_list(&WHOWASHASH[who->hashv], who);
  whowas_next++;

  if (whowas_next == NICKNAMEHISTORYLENGTH)
    whowas_next = 0;
}

void
off_history(struct Client *client_p)
{
  struct Whowas *temp, *next;

  for (temp = client_p->whowas; temp; temp=next)
  {
    next = temp->cnext;
    temp->online = NULL;
    del_whowas_from_clist(&(client_p->whowas), temp);
  }
}

struct Client *
get_history(const char *nick, time_t timelimit)
{
  struct Whowas *temp;

  timelimit = CurrentTime - timelimit;
  temp = WHOWASHASH[strhash(nick)];

  for (; temp; temp = temp->next)
  {
    if (irccmp(nick, temp->name))
      continue;
    if (temp->logoff < timelimit)
      continue;
    return temp->online;
  }

  return NULL;
}

void
count_whowas_memory(unsigned int *wwu, uint64_t *wwum)
{
  const struct Whowas *tmp;
  int i;
  unsigned int u = 0;
  uint64_t um = 0;

  /* count the number of used whowas structs in 'u'   */
  /* count up the memory used of whowas structs in um */
  for (i = 0, tmp = &WHOWAS[0]; i < NICKNAMEHISTORYLENGTH; ++i, ++tmp)
  {
    if (tmp->hashv != -1)
    {
      ++u;
      um += sizeof(struct Whowas);
    }
  }

  *wwu = u;
  *wwum = um;
}

void
init_whowas(void)
{
  int i;

  for (i = 0; i < NICKNAMEHISTORYLENGTH; i++)
  {
    memset(&WHOWAS[i], 0, sizeof(struct Whowas));
    WHOWAS[i].hashv = -1;
  }

  for (i = 0; i < HASHSIZE; ++i)
    WHOWASHASH[i] = NULL;        
}

static void
add_whowas_to_clist(struct Whowas **bucket, struct Whowas *whowas)
{
  whowas->cprev = NULL;

  if ((whowas->cnext = *bucket) != NULL)
    whowas->cnext->cprev = whowas;
  *bucket = whowas;
}
 
static void
del_whowas_from_clist(struct Whowas **bucket, struct Whowas *whowas)
{
  if (whowas->cprev)
    whowas->cprev->cnext = whowas->cnext;
  else
    *bucket = whowas->cnext;
  if (whowas->cnext)
    whowas->cnext->cprev = whowas->cprev;
}

static void
add_whowas_to_list(struct Whowas **bucket, struct Whowas *whowas)
{
  whowas->prev = NULL;

  if ((whowas->next = *bucket) != NULL)
    whowas->next->prev = whowas;
  *bucket = whowas;
}
 
static void
del_whowas_from_list(struct Whowas **bucket, struct Whowas *whowas)
{
  if (whowas->prev)
    whowas->prev->next = whowas->next;
  else
    *bucket = whowas->next;
  if (whowas->next)
    whowas->next->prev = whowas->prev;
}
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	* whowas.c: WHOWAS user cache.
4	*
5	* Copyright (C) 2005 by the past and present ircd coders, and others.
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20	* USA
21	*
22	* $Id$
23	*/
24
25	#include "stdinc.h"
26	#include "whowas.h"
27	#include "client.h"
28	#include "hash.h"
29	#include "irc_string.h"
30	#include "ircd.h"
31	#include "ircd_defs.h"
32	#include "numeric.h"
33	#include "s_serv.h"
34	#include "s_user.h"
35	#include "send.h"
36	#include "s_conf.h"
37	#include "memory.h"
38
39	/* internally defined function */
40	static void add_whowas_to_clist(struct Whowas *, struct Whowas );
41	static void del_whowas_from_clist(struct Whowas *, struct Whowas );
42	static void add_whowas_to_list(struct Whowas *, struct Whowas );
43	static void del_whowas_from_list(struct Whowas *, struct Whowas );
44
45	struct Whowas WHOWAS[NICKNAMEHISTORYLENGTH];
46	struct Whowas *WHOWASHASH[HASHSIZE];
47
48	static unsigned int whowas_next = 0;
49
50	void
51	add_history(struct Client *client_p, int online)
52	{
53	struct Whowas *who = &WHOWAS[whowas_next];
54
55	assert(client_p && client_p->servptr);
56
57	if (who->hashv != -1)
58	{
59	if (who->online)
60	del_whowas_from_clist(&(who->online->whowas),who);
61	del_whowas_from_list(&WHOWASHASH[who->hashv], who);
62	}
63
64	who->hashv = strhash(client_p->name);
65	who->logoff = CurrentTime;
66
67	/* NOTE: strcpy ok here, the sizes in the client struct MUST
68	* match the sizes in the whowas struct
69	*/
70	strlcpy(who->name, client_p->name, sizeof(who->name));
71	strcpy(who->username, client_p->username);
72	strcpy(who->hostname, client_p->host);
73	strcpy(who->realname, client_p->info);
74
75	strlcpy(who->servername, client_p->servptr->name, sizeof(who->servername));
76
77	if (online)
78	{
79	who->online = client_p;
80	add_whowas_to_clist(&(client_p->whowas), who);
81	}
82	else
83	who->online = NULL;
84
85	add_whowas_to_list(&WHOWASHASH[who->hashv], who);
86	whowas_next++;
87
88	if (whowas_next == NICKNAMEHISTORYLENGTH)
89	whowas_next = 0;
90	}
91
92	void
93	off_history(struct Client *client_p)
94	{
95	struct Whowas temp, next;
96
97	for (temp = client_p->whowas; temp; temp=next)
98	{
99	next = temp->cnext;
100	temp->online = NULL;
101	del_whowas_from_clist(&(client_p->whowas), temp);
102	}
103	}
104
105	struct Client *
106	get_history(const char *nick, time_t timelimit)
107	{
108	struct Whowas *temp;
109
110	timelimit = CurrentTime - timelimit;
111	temp = WHOWASHASH[strhash(nick)];
112
113	for (; temp; temp = temp->next)
114	{
115	if (irccmp(nick, temp->name))
116	continue;
117	if (temp->logoff < timelimit)
118	continue;
119	return temp->online;
120	}
121
122	return NULL;
123	}
124
125	void
126	count_whowas_memory(unsigned int wwu, uint64_t wwum)
127	{
128	const struct Whowas *tmp;
129	int i;
130	unsigned int u = 0;
131	uint64_t um = 0;
132
133	/* count the number of used whowas structs in 'u' */
134	/* count up the memory used of whowas structs in um */
135	for (i = 0, tmp = &WHOWAS[0]; i < NICKNAMEHISTORYLENGTH; ++i, ++tmp)
136	{
137	if (tmp->hashv != -1)
138	{
139	++u;
140	um += sizeof(struct Whowas);
141	}
142	}
143
144	*wwu = u;
145	*wwum = um;
146	}
147
148	void
149	init_whowas(void)
150	{
151	int i;
152
153	for (i = 0; i < NICKNAMEHISTORYLENGTH; i++)
154	{
155	memset(&WHOWAS[i], 0, sizeof(struct Whowas));
156	WHOWAS[i].hashv = -1;
157	}
158
159	for (i = 0; i < HASHSIZE; ++i)
160	WHOWASHASH[i] = NULL;
161	}
162
163	static void
164	add_whowas_to_clist(struct Whowas *bucket, struct Whowas whowas)
165	{
166	whowas->cprev = NULL;
167
168	if ((whowas->cnext = *bucket) != NULL)
169	whowas->cnext->cprev = whowas;
170	*bucket = whowas;
171	}
172
173	static void
174	del_whowas_from_clist(struct Whowas *bucket, struct Whowas whowas)
175	{
176	if (whowas->cprev)
177	whowas->cprev->cnext = whowas->cnext;
178	else
179	*bucket = whowas->cnext;
180	if (whowas->cnext)
181	whowas->cnext->cprev = whowas->cprev;
182	}
183
184	static void
185	add_whowas_to_list(struct Whowas *bucket, struct Whowas whowas)
186	{
187	whowas->prev = NULL;
188
189	if ((whowas->next = *bucket) != NULL)
190	whowas->next->prev = whowas;
191	*bucket = whowas;
192	}
193
194	static void
195	del_whowas_from_list(struct Whowas *bucket, struct Whowas whowas)
196	{
197	if (whowas->prev)
198	whowas->prev->next = whowas->next;
199	else
200	*bucket = whowas->next;
201	if (whowas->next)
202	whowas->next->prev = whowas->prev;
203	}
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